330 PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. [June 28, 
fissures of greater or less width ; but it may be resolved into the same 
components as that of Man, by taking into account the attachment 
of the ligaments, and the position of the vessels, gall-bladder, and 
ligaments. 
The liver of the Angwantibo. A, viewed from above; B, from below. Cy, co- 
ronary ligament; ZQ, lobulus quadratus; #, right; LZ, left lobe; /s, lobulus 
Spigelii ; Uv, umbilical vein ; », hepatic vein. 
Thus the upper surface (fig. 10, A) exhibits the attachment of the 
broad ligament, m ; the moiety of the liver to the left of this (f, g, 4) 
answers to the left lobe of the Human liver, that to the right (a, 4, 
c,e) to the right lobe in Man. But, in the Angwantibo, the left lobe 
is the larger and more solid, being divided by narrow fissures only into 
three lobules (f, g, 2). The fissure between fand g is far deeper 
than the other, extending from the front margin nearly to the portal 
vessels. 
The right half is divided by deep and wide fissures into four 
lobules (a, 6, c, and e). The largest of these (e) is situated between 
the ductus venosus and the gall-bladder (@) ; it therefore corresponds 
to the lobulus quadratus. The other three are subdivisions of the 
right lobe. Besides these, on the under surface of the liver, behind 
the portal vessels, is a small lobule, which is transversely elongated 
and raised into a point at each end. This corresponds with the 
lobulus Spigelii, and indeed somewhat resembles that part in the 
Orang. 
The coronary ligament is attached to the edge of the hindermost 
division of the right lobe, and, for a short distance, to the lobule A 
of the left lobe. 
The gall-bladder is long and somewhat undulating ; in consequence 
of the great breadth of the lobulus quadratus in front, its end is 
turned more to the right side than forwards. 
The ductus choledochus opens into the duodenum at not more than 
0-4 inch from the pylorus. Fixed upon it, as it were, close to its 
termination, is the pancreas, which consists of two branches, one of 
which lies behind the stomach and nearly touches the spleen by its free 
end, while the other is enclosed in the loop of the duodenum (fig. 8). 
